On Impact ivith a Liquid Surface. 



219 



In the same way the radial strise and ribs which characterise the 

 hollow formed round a drop or solid sphere impinging on a liquid 

 surface, are accounted for by the instability of the annular rim of the 

 hollow, which through its tendency to cleave into a definite number 

 of drops, determines a corresponding number of lines of easiest flow, 

 at each of which a rib or arm is developed. 



The author has observed that after the details have been once 

 revealed by the method of instantaneous illumination, it is not difficult 

 to identify the broad features of any splash that may occur by 

 attentive observation in continuous light. Such observation may 

 afford valuable information as to the condition of the surface of an 

 impinging solid. 



[What follows is extracted from tlie "Description of the Phenomena."] 



Series I. 



